Lubricating oil



Reisoued 5, 193,8

Cleveland, Ohio, assignorl Company (Ohio), Cleveland, Ohio, a corporation of Ohio No Drawing. Original No. 2,007,162, dated omber :0, 1m, Serial No. 42,881, September so,

1035. Application for 1937, Serial No. 117,812

December 1,

2 Claims. (01. 85-9).

This invention relates to mineral oils, and more cularly oils which are subjected to usage in temperature exposure; and it is among the objects of the invention to provide an oil which is resistant against degradation changes, and with excellent lubricating properties, V To the accomplishment of the foregoing and related ends, the invention, ,then, comprises the features hereinafter 'fully described, and par- 10 ticularlv pointed out in' the claims, the following description settlng'iorth in detail certain illustrative embodiments of the invention, these being indicative however, oi buta few of the various ways in which the principle oi the invention may be employed. i

It has been known forsome time that mineral oils to which small quantities of certain agents have been added are more durable in transformers and in lubricating usage, the action being ascribed to prevention of oxidation. We have found how ever, that where oils are subjected to high temperature We. as for instance in internal combustion engine crank cases, the factors making for. degradation of the oil are not so simple, but involve complex action, including apparent polymeriaation. and molecular change, and in such usage we have found certain compositions which are particularlydurable and elective in drastic usage.

I In accordance with the present invention, a mineral oil of greater or less viscosity, as preferred in any given instance, oils ior example from a viscosity of}? sec. 8. U. at 210 1". to 190 sec.

S. U. at 210 F. are employed, and with the oil is incorporated one or more phenyl compounds of the following: tetramethyl diaminodiphenylmethane, symmetrical diphenylethylenediamine, para-acetylaminophenol, xylenols, phenyl betanaphthylarnine. The proportion. of such phenyl compound may range from 0.001 to 5 per cent, but amounts of less than 1 per cent are ordinarily sufllcient. Y As an example: 0.01 per cent of symmetrical diphenylethylenediamine is incorporated with a lubricating 'oil of 53 sec. at 210 It, being thoroughly mixed.

As another example: 0.01 per cent of xylenols is mixed with a lubricating oil of 53 sec. at 210 F. Other modes of applying the principle of the invention may be employed, change being made as regards the details described, provided the features stated in any of the following claims. or the equivalent of such, be employed. We therefore particularly. point out and distinctly claim as our invention:- I l 1. A process of inhibiting degradation 01 mineral lubricating oils in'exposure to heat,. which comprises incorporating with the oil a' degradation-inhibiting amount of tetramethyldiaminodiphenylmethane. r

2. A mineral lubricating oil containing a degradation-inhibiting amount of tetramethyldiaminodiphenylmethane.

JOHN M. MUSSELMAN. v HERMAN P. LANKELIMZAP 

